diff --git a/CMakeLists.txt b/CMakeLists.txt
index d39958a05c..66436298c5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -124,6 +124,22 @@ if(CMAKE_SIZEOF_VOID_P LESS 8)
 	message(WARNING "Pointer size ${CMAKE_SIZEOF_VOID_P} is not supported. Please use a 64-bit compiler.")
 endif()
 
+# check CreateFile2 for mingw
+INCLUDE(CheckCXXSourceCompiles)
+if(MINGW)
+	check_cxx_source_compiles("#include <windows.h>
+	#include <fileapi.h>
+	int main() {
+		HANDLE h = CreateFile2(L\"nul\", GENERIC_READ, FILE_SHARE_READ, OPEN_EXISTING, NULL);
+		if (h != INVALID_HANDLE_VALUE) CloseHandle(h);
+		return 0;
+	}" HAVE_CREATEFILE2)
+
+	if(HAVE_CREATEFILE2)
+		add_compile_definitions(HAVE_CREATEFILE2)
+	endif()
+endif()
+
 # Set some variables that are used in-tree and while building based on our options
 set(HTTPLIB_IS_COMPILED ${HTTPLIB_COMPILE})
 set(HTTPLIB_IS_USING_CERTS_FROM_MACOSX_KEYCHAIN ${HTTPLIB_USE_CERTS_FROM_MACOSX_KEYCHAIN})
diff --git a/httplib.h b/httplib.h
index 52b1b829f7..4ba5bbb59a 100644
--- a/httplib.h
+++ b/httplib.h
@@ -3078,8 +3078,13 @@ inline bool mmap::open(const char *path) {
   auto wpath = u8string_to_wstring(path);
   if (wpath.empty()) { return false; }
 
+#if defined(HAVE_CREATEFILE2)
   hFile_ = ::CreateFile2(wpath.c_str(), GENERIC_READ, FILE_SHARE_READ,
                          OPEN_EXISTING, NULL);
+#else
+  hFile_ = ::CreateFileW(wpath.c_str(), GENERIC_READ, FILE_SHARE_READ, NULL,
+                         OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+#endif
 
   if (hFile_ == INVALID_HANDLE_VALUE) { return false; }